8865521280 has 640 divisors, whose sum is σ = 39490450560. Its totient is φ = 1841356800.

The previous prime is 8865521279. The next prime is 8865521347. The reversal of 8865521280 is 821255688.

8865521280 is a `hidden beast` number, since 8 + 8 + 6 + 552 + 12 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×8865521280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3990570 + ... + 3992790.

It is an arithmetic number, because the mean of its divisors is an integer number (61703829).

Almost surely, 2^8865521280 is an apocalyptic number.

8865521280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8865521280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19745225280).

8865521280 is an abundant number, since it is smaller than the sum of its proper divisors (30624929280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8865521280 is a wasteful number, since it uses less digits than its factorization.

8865521280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 8865521280 is about 94156.8971451375. The cubic root of 8865521280 is about 2069.6715294811.

The spelling of 8865521280 in words is "eight billion, eight hundred sixty-five million, five hundred twenty-one thousand, two hundred eighty".